From the look of it and comparing to the other items on the picture, I would say that it is not sharp at all, it is I would guess is about 1/16 of an inch, somewhere in the are between 1 and 2 mm. You can definitely see the flat edge in the middle part.

I sent a link of the pix to my mummy-in-law. She has never seen one, but she wrote, "For some reason It sticks in my mind that it had something to do with butter making. You know making small pats instead of pounds. Let me know if you find out."

__________________
May you live as long as you wish and love as long as you live.
Robert A. Heinlein

Its not sharp like a knife, its 1-2mm narrower than the outer tines. What is the purpose of a key with curved edges besides would it not be an overly simple design? Or was that not a serious idea!
I still think its designed to crush/blend/mash...........

Its not sharp like a knife, its 1-2mm narrower than the outer tines. What is the purpose of a key with curved edges besides would it not be an overly simple design? Or was that not a serious idea!
I still think its designed to crush/blend/mash...........

It was a serious idea.
I remember seeing a latch or handle on a walk in freezer one time and the handle was inserted into three slots.
It was pushed into the slots and raised or lowered opening the door.
Then the clerk would take the key away with them for safe keeping.

I remember this, but have no idea as to the origin of these memories.
But something tells me that tool inserts into something to do a mechanical operation? Just taking a stab.